i need help with a 6-player x-men game

henryt

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I'm pretty knew to this and have a 6-player x-men game that isn't working correctly at first one monitor wouldn't turn on and I traced it down to a wire that popped off the transformer. The screen worked, but was white and the game would still play fine though. from there I found 2 broken "adjustable" resistor on a board labeled 8264p-001. I talked to some one who gave me what looked to be an almost identical board to replace it the only difference i thought was the knobs and the board was labeled 8264p-001b. Needless to say the game didn't like it, so i scrounged through my other games and found one. now both displays are on and its giving me and error and the game will not start. i also tried a third board to see if thats the problem, which it wasn't. the game starts up and says VERSION VCB ROM RAM CHECK COMPLETE !!! DEFECTED IC FOUND! and on the other screen it shows 18J OK 18G OK, 17J OK, 17G OK, 15J OK, 15G OK, 9K OK, 10K OK,
17D OK, 16D OK, 2M OK, 3M OK, 4M OK, 16B BAD, 7B OK, 6B OK, 4E OK, 3E OK. What i need to know is where do i go from here. I haven't been able to find a manual for a six player yet, and my knowledge in the subjuct is lacking. i have about 27 games but only 8 or so are working, so getting parts isn't that bad. I just don't know what to do
 
Looking at the manual now... nothing on error codes. If 16B means the chip location, 16B is part # ER5911 which is a serial EPROM from Microchip.
http://www.alldatasheet.com/datasheet-pdf/pdf/101667/MICROCHIP/ER5911.html

If that part is bad, could be that it just needs to be re-programmed.
Or, the logic around the part could be messed up such that the CPU thinks its bad.

Only way to tell would be to pull the part, dump the contents and compare to the MAME driver. (Assuming the driver has a dump)
 
I've repaired Konami boards like that before... One needed the EEPROM reset, another had a bad EEPROM chip, and the third had a bad 74xx logic chip that connected to the EEPROM.

It's a crapshoot as to what the problem is.

RJ
 
It lives!!!!!!!!!!!!!!!!!!

Thanks everyone!!! It's alive and working perfectly. I did the "reset" with the test switch and it all came to life. I can't thank you all enough and my soldered replacement 8264p-001 board is working fine as well. You'll probably be seeing me on here alot more as i still have 20 more games to fix or scavange for parts.
 
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